钢轨探伤，37°探头对应通道，在报警门后沿附近有反射回波，应考虑（），并用反光镜等手工检查方法确认。
参考答案：轨底中心横向裂纹
It was demanded that the injured crewmembers（）at once.
A.was treated
B.would be treated
C.being treated
D.be treated
简述矿井水灾的通道有哪些？
